Preheat the oven to 350 degrees F. Grease and flour a 13 by 9-inch baking pan.
Combine the sugar, salt, and flour in a large mixing bowl. Bring the butter, oil, cocoa, and 1/4 cup water to a boil in a saucepan. Add to the flour mixture.
Beat together the eggs, baking soda, buttermilk, and vanilla. Add to the chocolate mixture, mix well, and pour into the prepared pan. Bake for 25 minutes.
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